generate physical coordinates for up comming change of marching tetra
use physical coordinates instead of grid coordinates to generate geometries
change the output type of grid_coordinates_functor to thrust::tuple<> to be consistent with other sources
Putting in more #defines to differentiate behavior of image3d and tangle_field between distributed and on-node behavior
Merge branch 'master' of github.com:losalamos/PISTON
initialize data members in the constructors
add method and iterators for physical coordinates
Merge branch 'phys_coord_tetra'
Getting render operator demo to work properly again
added the merge tree based haloFinder code in halo_merge.h, included the GUI version for that code in halorenderMergeTree.cpp, included the code to run this version in halo.cpp with other tests & also added code to verify results at the end, Corrected an error in the vtk based version in halo_vtk.h, added the naive halo finder implementation for comparison ...